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428
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1 /* Declarations having to do with XEmacs syntax tables.
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2 Copyright (C) 1985, 1992, 1993 Free Software Foundation, Inc.
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793
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3 Copyright (C) 2002 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.28. */
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23
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440
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24 #ifndef INCLUDED_syntax_h_
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25 #define INCLUDED_syntax_h_
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428
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26
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27 #include "chartab.h"
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28
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29 /* A syntax table is a type of char table.
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30
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31 The low 7 bits of the integer is a code, as follows. The 8th bit is
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32 used as the prefix bit flag (see below).
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33
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34 The values in a syntax table are either integers or conses of
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35 integers and chars. The lowest 7 bits of the integer are the syntax
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36 class. If this is Sinherit, then the actual syntax value needs to
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37 be retrieved from the standard syntax table.
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38
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39 Since the logic involved in finding the actual integer isn't very
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40 complex, you'd think the time required to retrieve it is not a
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41 factor. If you thought that, however, you'd be wrong, due to the
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42 high number of times (many per character) that the syntax value is
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43 accessed in functions such as scan_lists(). To speed this up,
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44 we maintain a mirror syntax table that contains the actual
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45 integers. We can do this successfully because syntax tables are
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46 now an abstract type, where we control all access.
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47 */
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48
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49 enum syntaxcode
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50 {
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51 Swhitespace, /* whitespace character */
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52 Spunct, /* random punctuation character */
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53 Sword, /* word constituent */
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54 Ssymbol, /* symbol constituent but not word constituent */
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55 Sopen, /* a beginning delimiter */
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56 Sclose, /* an ending delimiter */
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57 Squote, /* a prefix character like Lisp ' */
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58 Sstring, /* a string-grouping character like Lisp " */
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59 Smath, /* delimiters like $ in TeX. */
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60 Sescape, /* a character that begins a C-style escape */
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61 Scharquote, /* a character that quotes the following character */
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62 Scomment, /* a comment-starting character */
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63 Sendcomment, /* a comment-ending character */
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64 Sinherit, /* use the standard syntax table for this character */
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460
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65 Scomment_fence, /* Starts/ends comment which is delimited on the
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66 other side by a char with the same syntaxcode. */
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67 Sstring_fence, /* Starts/ends string which is delimited on the
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68 other side by a char with the same syntaxcode. */
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428
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69 Smax /* Upper bound on codes that are meaningful */
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70 };
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71
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72 enum syntaxcode charset_syntax (struct buffer *buf, Lisp_Object charset,
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73 int *multi_p_out);
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74
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75 /* Return the syntax code for a particular character and mirror table. */
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76
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77 #define SYNTAX_CODE_UNSAFE(table, c) \
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78 XINT (CHAR_TABLE_VALUE_UNSAFE (table, c))
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79
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442
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80 INLINE_HEADER int SYNTAX_CODE (Lisp_Char_Table *table, Emchar c);
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81 INLINE_HEADER int
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440
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82 SYNTAX_CODE (Lisp_Char_Table *table, Emchar c)
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428
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83 {
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84 return SYNTAX_CODE_UNSAFE (table, c);
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85 }
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86
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87 #define SYNTAX_UNSAFE(table, c) \
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88 ((enum syntaxcode) (SYNTAX_CODE_UNSAFE (table, c) & 0177))
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89
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90 #define SYNTAX_FROM_CODE(code) ((enum syntaxcode) ((code) & 0177))
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91 #define SYNTAX(table, c) SYNTAX_FROM_CODE (SYNTAX_CODE (table, c))
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92
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442
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93 INLINE_HEADER int WORD_SYNTAX_P (Lisp_Char_Table *table, Emchar c);
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94 INLINE_HEADER int
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440
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95 WORD_SYNTAX_P (Lisp_Char_Table *table, Emchar c)
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428
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96 {
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97 return SYNTAX (table, c) == Sword;
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98 }
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99
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100 /* OK, here's a graphic diagram of the format of the syntax values:
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101
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102 Bit number:
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103
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104 [ 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 ]
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105 [ 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 ]
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106
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107 <-----> <-----> <-------------> <-------------> ^ <----------->
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108 ELisp unused |comment bits | unused | syntax code
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109 tag | | | | | | | | |
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110 stuff | | | | | | | | |
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111 | | | | | | | | |
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112 | | | | | | | | `--> prefix flag
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113 | | | | | | | |
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114 | | | | | | | `--> comment end style B, second char
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115 | | | | | | `----> comment end style A, second char
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116 | | | | | `------> comment end style B, first char
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117 | | | | `--------> comment end style A, first char
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118 | | | `----------> comment start style B, second char
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119 | | `------------> comment start style A, second char
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120 | `--------------> comment start style B, first char
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121 `----------------> comment start style A, first char
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122
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123 In a 64-bit integer, there would be 32 more unused bits between
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124 the tag and the comment bits.
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125
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126 Clearly, such a scheme will not work for Mule, because the matching
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127 paren could be any character and as such requires 19 bits, which
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128 we don't got.
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129
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130 Remember that under Mule we use char tables instead of vectors.
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131 So what we do is use another char table for the matching paren
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132 and store a pointer to it in the first char table. (This frees
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133 code from having to worry about passing two tables around.)
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134 */
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135
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136
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137 /* The prefix flag bit for backward-prefix-chars is now put into bit 7. */
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138
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139 #define SYNTAX_PREFIX_UNSAFE(table, c) \
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140 ((SYNTAX_CODE_UNSAFE (table, c) >> 7) & 1)
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141 #define SYNTAX_PREFIX(table, c) \
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142 ((SYNTAX_CODE (table, c) >> 7) & 1)
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143
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144 /* Bits 23-16 are used to implement up to two comment styles
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145 in a single buffer. They have the following meanings:
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146
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147 1. first of a one or two character comment-start sequence of style a.
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148 2. first of a one or two character comment-start sequence of style b.
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149 3. second of a two-character comment-start sequence of style a.
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150 4. second of a two-character comment-start sequence of style b.
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151 5. first of a one or two character comment-end sequence of style a.
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152 6. first of a one or two character comment-end sequence of style b.
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153 7. second of a two-character comment-end sequence of style a.
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154 8. second of a two-character comment-end sequence of style b.
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155 */
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156
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157 #define SYNTAX_COMMENT_BITS(table, c) \
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158 ((SYNTAX_CODE (table, c) >> 16) &0xff)
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159
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160 #define SYNTAX_FIRST_OF_START_A 0x80
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161 #define SYNTAX_FIRST_OF_START_B 0x40
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162 #define SYNTAX_SECOND_OF_START_A 0x20
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163 #define SYNTAX_SECOND_OF_START_B 0x10
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164 #define SYNTAX_FIRST_OF_END_A 0x08
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165 #define SYNTAX_FIRST_OF_END_B 0x04
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166 #define SYNTAX_SECOND_OF_END_A 0x02
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167 #define SYNTAX_SECOND_OF_END_B 0x01
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168
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169 #define SYNTAX_COMMENT_STYLE_A 0xaa
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170 #define SYNTAX_COMMENT_STYLE_B 0x55
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171 #define SYNTAX_FIRST_CHAR_START 0xc0
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172 #define SYNTAX_FIRST_CHAR_END 0x0c
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173 #define SYNTAX_FIRST_CHAR 0xcc
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174 #define SYNTAX_SECOND_CHAR_START 0x30
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175 #define SYNTAX_SECOND_CHAR_END 0x03
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176 #define SYNTAX_SECOND_CHAR 0x33
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177
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178
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442
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179 /* #### These are now more or less equivalent to
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180 SYNTAX_COMMENT_MATCH_START ...*/
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181 /* a and b must be first and second start chars for a common type */
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182 #define SYNTAX_START_P(table, a, b) \
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183 (((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START) >> 2) \
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184 & (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START))
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185
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186 /* ... and SYNTAX_COMMENT_MATCH_END */
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187 /* a and b must be first and second end chars for a common type */
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188 #define SYNTAX_END_P(table, a, b) \
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189 (((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END) >> 2) \
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190 & (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END))
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428
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191
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192 #define SYNTAX_STYLES_MATCH_START_P(table, a, b, mask) \
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193 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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194 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START & (mask)))
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195
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196 #define SYNTAX_STYLES_MATCH_END_P(table, a, b, mask) \
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197 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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198 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END & (mask)))
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199
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200 #define SYNTAX_STYLES_MATCH_1CHAR_P(table, a, mask) \
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201 ((SYNTAX_COMMENT_BITS (table, a) & (mask)))
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202
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203 #define STYLE_FOUND_P(table, a, b, startp, style) \
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204 ((SYNTAX_COMMENT_BITS (table, a) & \
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205 ((startp) ? SYNTAX_FIRST_CHAR_START : \
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206 SYNTAX_FIRST_CHAR_END) & (style)) \
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207 && (SYNTAX_COMMENT_BITS (table, b) & \
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208 ((startp) ? SYNTAX_SECOND_CHAR_START : \
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209 SYNTAX_SECOND_CHAR_END) & (style)))
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210
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211 #define SYNTAX_COMMENT_MASK_START(table, a, b) \
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212 ((STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_A) \
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213 ? SYNTAX_COMMENT_STYLE_A \
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214 : (STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_B) \
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215 ? SYNTAX_COMMENT_STYLE_B \
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216 : 0)))
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217
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218 #define SYNTAX_COMMENT_MASK_END(table, a, b) \
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219 ((STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_A) \
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220 ? SYNTAX_COMMENT_STYLE_A \
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221 : (STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_B) \
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222 ? SYNTAX_COMMENT_STYLE_B \
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223 : 0)))
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224
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225 #define STYLE_FOUND_1CHAR_P(table, a, style) \
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226 ((SYNTAX_COMMENT_BITS (table, a) & (style)))
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227
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228 #define SYNTAX_COMMENT_1CHAR_MASK(table, a) \
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229 ((STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_A) \
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230 ? SYNTAX_COMMENT_STYLE_A \
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231 : (STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_B) \
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232 ? SYNTAX_COMMENT_STYLE_B \
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233 : 0)))
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234
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235 EXFUN (Fchar_syntax, 2);
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236 EXFUN (Fforward_word, 2);
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237
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238 /* The standard syntax table is stored where it will automatically
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239 be used in all new buffers. */
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240 extern Lisp_Object Vstandard_syntax_table;
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241
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242 /* This array, indexed by a character, contains the syntax code which
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243 that character signifies (as a char).
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244 For example, (enum syntaxcode) syntax_spec_code['w'] is Sword. */
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245
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442
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246 extern const unsigned char syntax_spec_code[0400];
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428
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247
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248 /* Indexed by syntax code, give the letter that describes it. */
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249
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442
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250 extern const unsigned char syntax_code_spec[];
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428
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251
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665
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252 Lisp_Object scan_lists (struct buffer *buf, Charbpos from, int count,
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428
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253 int depth, int sexpflag, int no_error);
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665
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254 int char_quoted (struct buffer *buf, Charbpos pos);
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428
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255
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256 /* NOTE: This does not refer to the mirror table, but to the
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257 syntax table itself. */
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258 Lisp_Object syntax_match (Lisp_Object table, Emchar ch);
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259
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260 extern int no_quit_in_re_search;
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261 extern struct buffer *regex_emacs_buffer;
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460
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262
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263 /* This is the string or buffer in which we are matching. It is used
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264 for looking up syntax properties. */
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265 extern Lisp_Object regex_match_object;
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428
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266
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440
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267 void update_syntax_table (Lisp_Char_Table *ct);
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428
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268
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460
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269 #ifdef emacs
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270
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271 extern int lookup_syntax_properties;
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272
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273 struct syntax_cache
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274 {
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275 int use_code; /* Whether to use syntax_code
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276 or current_syntax_table. */
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277 struct buffer* buffer; /* The buffer the current syntax cache
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278 applies to. */
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279 Lisp_Object object; /* The buffer or string the current
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280 syntax cache applies to. */
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281 int syntax_code; /* Syntax code of current char. */
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282 Lisp_Object current_syntax_table; /* Syntax table for current pos. */
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283 Lisp_Object old_prop; /* Syntax-table prop at prev pos. */
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284
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665
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285 Charbpos next_change; /* Position of the next extent
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460
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286 change. */
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665
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287 Charbpos prev_change; /* Position of the previous
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460
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288 extent change. */
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289 };
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290 extern struct syntax_cache syntax_cache;
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291
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292 void update_syntax_cache (int pos, int count, int init);
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293
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294 /* Make syntax cache state good for CHARPOS, assuming it is
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295 currently good for a position before CHARPOS. */
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296 #define UPDATE_SYNTAX_CACHE_FORWARD(pos) \
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297 (lookup_syntax_properties \
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298 ? (update_syntax_cache ((pos), 1, 0), 1) \
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299 : 0)
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300
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301 /* Make syntax cache state good for CHARPOS, assuming it is
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302 currently good for a position after CHARPOS. */
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303 #define UPDATE_SYNTAX_CACHE_BACKWARD(pos) \
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304 (lookup_syntax_properties \
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305 ? (update_syntax_cache ((pos), -1, 0), 1) \
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306 : 0)
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307
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308 /* Make syntax cache state good for CHARPOS */
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309 #define UPDATE_SYNTAX_CACHE(pos) \
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310 (lookup_syntax_properties \
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311 ? (update_syntax_cache ((pos), 0, 0), 1) \
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312 : 0)
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313
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314 #define SYNTAX_FROM_CACHE(table, c) \
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315 SYNTAX_FROM_CODE (SYNTAX_CODE_FROM_CACHE (table, c))
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316
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317 #define SYNTAX_CODE_FROM_CACHE(table, c) \
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318 ( syntax_cache.use_code \
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319 ? syntax_cache.syntax_code \
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320 : SYNTAX_CODE (XCHAR_TABLE (syntax_cache.current_syntax_table), \
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321 c) \
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322 )
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323
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324 /* Convert the byte offset BYTEPOS into a character position,
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325 for the object recorded in syntax_cache with SETUP_SYNTAX_TABLE_FOR_OBJECT.
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326
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327 The value is meant for use in the UPDATE_SYNTAX_TABLE... macros.
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328 These macros do nothing when parse_sexp_lookup_properties is 0,
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329 so we return 0 in that case, for speed. */
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771
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330 #define SYNTAX_CACHE_BYTE_TO_CHAR(bytepos) \
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331 (! lookup_syntax_properties \
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332 ? 0 \
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333 : STRINGP (syntax_cache.object) \
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793
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334 ? string_index_byte_to_char (syntax_cache.object, bytepos) \
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771
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335 : (BUFFERP (syntax_cache.object) || NILP (syntax_cache.object)) \
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336 ? bytebpos_to_charbpos (syntax_cache.buffer, \
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337 bytepos + BI_BUF_BEGV (syntax_cache.buffer)) \
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460
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338 : (bytepos))
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339
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340 #define SYNTAX_CACHE_OBJECT_BYTE_TO_CHAR(obj, buf, bytepos) \
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341 (! lookup_syntax_properties \
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342 ? 0 \
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343 : STRINGP (obj) \
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793
|
344 ? string_index_byte_to_char (obj, bytepos) \
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460
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345 : (BUFFERP (obj) || NILP (obj)) \
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665
|
346 ? bytebpos_to_charbpos (buf, bytepos + BI_BUF_BEGV (buf)) \
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460
|
347 : (bytepos))
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348
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349 #else /* not emacs */
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350
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351 #define update_syntax_cache(pos, count, init)
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352 #define UPDATE_SYNTAX_CACHE_FORWARD(pos)
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353 #define UPDATE_SYNTAX_CACHE_BACKWARD(pos)
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354 #define UPDATE_SYNTAX_CACHE(pos)
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355 #define SYNTAX_FROM_CACHE SYNTAX
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356 #define SYNTAX_CODE_FROM_CACHE SYNTAX_CODE
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357
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358 #endif /* emacs */
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359
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360 #define SETUP_SYNTAX_CACHE(FROM, COUNT) \
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361 do { \
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362 syntax_cache.buffer = current_buffer; \
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363 syntax_cache.object = Qnil; \
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364 syntax_cache.current_syntax_table \
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365 = current_buffer->mirror_syntax_table; \
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366 syntax_cache.use_code = 0; \
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367 if (lookup_syntax_properties) \
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368 update_syntax_cache ((COUNT) > 0 ? (FROM) : (FROM) - 1, \
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369 (COUNT), 1); \
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370 } while (0)
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371
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372 #define SETUP_SYNTAX_CACHE_FOR_BUFFER(BUFFER, FROM, COUNT) \
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373 do { \
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374 syntax_cache.buffer = (BUFFER); \
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375 syntax_cache.object = Qnil; \
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376 syntax_cache.current_syntax_table = \
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377 syntax_cache.buffer->mirror_syntax_table; \
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378 syntax_cache.use_code = 0; \
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379 if (lookup_syntax_properties) \
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380 update_syntax_cache ((FROM) + ((COUNT) > 0 ? 0 : -1), \
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381 (COUNT), 1); \
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382 } while (0)
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383
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384 #define SETUP_SYNTAX_CACHE_FOR_OBJECT(OBJECT, BUFFER, FROM, COUNT) \
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385 do { \
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386 syntax_cache.buffer = (BUFFER); \
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387 syntax_cache.object = (OBJECT); \
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388 if (NILP (syntax_cache.object)) \
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389 { \
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390 /* do nothing */; \
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391 } \
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392 else if (EQ (syntax_cache.object, Qt)) \
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393 { \
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394 /* do nothing */; \
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395 } \
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396 else if (STRINGP (syntax_cache.object)) \
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397 { \
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398 /* do nothing */; \
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399 } \
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400 else if (BUFFERP (syntax_cache.object)) \
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401 { \
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402 syntax_cache.buffer = XBUFFER (syntax_cache.object); \
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403 } \
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404 else \
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405 { \
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406 /* OBJECT must be buffer/string/t/nil */ \
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407 assert(0); \
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408 } \
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409 syntax_cache.current_syntax_table \
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410 = syntax_cache.buffer->mirror_syntax_table; \
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411 syntax_cache.use_code = 0; \
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412 if (lookup_syntax_properties) \
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413 update_syntax_cache ((FROM) + ((COUNT) > 0 ? 0 : -1), \
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414 (COUNT), 1); \
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415 } while (0)
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416
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417 #define SYNTAX_CODE_PREFIX(c) \
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418 ((c >> 7) & 1)
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419
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420 #define SYNTAX_CODE_COMMENT_BITS(c) \
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421 ((c >> 16) &0xff)
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422
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423 #define SYNTAX_CODES_START_P(a, b) \
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424 (((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START) >> 2) \
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425 & (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_START))
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426
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427 #define SYNTAX_CODES_END_P(a, b) \
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428 (((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END) >> 2) \
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429 & (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_END))
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430
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431 #define SYNTAX_CODES_COMMENT_MASK_START(a, b) \
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432 (SYNTAX_CODES_MATCH_START_P (a, b, SYNTAX_COMMENT_STYLE_A) \
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433 ? SYNTAX_COMMENT_STYLE_A \
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434 : (SYNTAX_CODES_MATCH_START_P (a, b, SYNTAX_COMMENT_STYLE_B) \
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435 ? SYNTAX_COMMENT_STYLE_B \
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436 : 0))
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437 #define SYNTAX_CODES_COMMENT_MASK_END(a, b) \
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438 (SYNTAX_CODES_MATCH_END_P (a, b, SYNTAX_COMMENT_STYLE_A) \
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439 ? SYNTAX_COMMENT_STYLE_A \
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440 : (SYNTAX_CODES_MATCH_END_P (a, b, SYNTAX_COMMENT_STYLE_B) \
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441 ? SYNTAX_COMMENT_STYLE_B \
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442 : 0))
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443
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444 #define SYNTAX_CODE_START_FIRST_P(a) \
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445 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START)
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446
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447 #define SYNTAX_CODE_START_SECOND_P(a) \
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448 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_SECOND_CHAR_START)
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449
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450 #define SYNTAX_CODE_END_FIRST_P(a) \
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451 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END)
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452
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453 #define SYNTAX_CODE_END_SECOND_P(a) \
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454 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_SECOND_CHAR_END)
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455
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456
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457 #define SYNTAX_CODES_MATCH_START_P(a, b, mask) \
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458 ((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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459 && (SYNTAX_CODE_COMMENT_BITS (b) \
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460 & SYNTAX_SECOND_CHAR_START & (mask)))
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461
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462 #define SYNTAX_CODES_MATCH_END_P(a, b, mask) \
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463 ((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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464 && (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_END & (mask)))
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465
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466 #define SYNTAX_CODE_MATCHES_1CHAR_P(a, mask) \
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467 ((SYNTAX_CODE_COMMENT_BITS (a) & (mask)))
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468
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469 #define SYNTAX_CODE_COMMENT_1CHAR_MASK(a) \
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470 ((SYNTAX_CODE_MATCHES_1CHAR_P (a, SYNTAX_COMMENT_STYLE_A) \
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471 ? SYNTAX_COMMENT_STYLE_A \
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472 : (SYNTAX_CODE_MATCHES_1CHAR_P (a, SYNTAX_COMMENT_STYLE_B) \
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473 ? SYNTAX_COMMENT_STYLE_B \
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474 : 0)))
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475
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476
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440
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477 #endif /* INCLUDED_syntax_h_ */
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